| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.tuscany.sca.implementation.spring.processor; |
| |
| import java.beans.PropertyDescriptor; |
| import java.lang.annotation.Annotation; |
| import java.lang.reflect.Field; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Modifier; |
| |
| import org.apache.tuscany.sca.implementation.spring.provider.ComponentWrapper; |
| import org.oasisopen.sca.annotation.Reference; |
| import org.springframework.beans.BeanUtils; |
| import org.springframework.beans.BeansException; |
| import org.springframework.beans.FatalBeanException; |
| import org.springframework.beans.factory.config.BeanPostProcessor; |
| import org.springframework.util.Assert; |
| import org.springframework.util.ReflectionUtils; |
| |
| public class ReferenceAnnotationProcessor implements BeanPostProcessor { |
| |
| private Class<? extends Annotation> referenceAnnotationType = Reference.class; |
| private ComponentWrapper component; |
| |
| public ReferenceAnnotationProcessor(ComponentWrapper component) { |
| this.component = component; |
| } |
| |
| /** |
| * Gets referece annotation type. |
| */ |
| protected Class<? extends Annotation> getReferenceAnnotationType() { |
| return this.referenceAnnotationType; |
| } |
| |
| /** |
| * Sets referece annotation type. |
| */ |
| public void setReferenceAnnotationType(Class<? extends Annotation> referenceAnnotationType) { |
| Assert.notNull(referenceAnnotationType, "'referenceAnnotationType' type must not be null."); |
| this.referenceAnnotationType = referenceAnnotationType; |
| } |
| |
| /** |
| * This method is used to execute before a bean's initialization callback. |
| * |
| * @see org.springframework.beans.factory.config.BeanPostProcessor#postProcessBeforeInitialization(java.lang.Object, java.lang.String) |
| */ |
| public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException { |
| processAnnotation(bean); |
| return bean; |
| } |
| |
| /** |
| * This method is used to execute after a bean's initialization callback. |
| * |
| * @see org.springframework.beans.factory.config.BeanPostProcessor#postProcessAfterInitialization(java.lang.Object, java.lang.String) |
| */ |
| public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException { |
| return bean; |
| } |
| |
| /** |
| * <p>Processes a beans fields for injection if it has a {@link Reference} annotation.</p> |
| */ |
| protected void processAnnotation(final Object bean) { |
| |
| final Class<?> clazz = bean.getClass(); |
| |
| ReflectionUtils.doWithMethods(clazz, new ReflectionUtils.MethodCallback() { |
| public void doWith(Method method) { |
| |
| Reference annotation = (Reference)method.getAnnotation(getReferenceAnnotationType()); |
| |
| if (annotation != null) { |
| if (Modifier.isStatic(method.getModifiers())) { |
| throw new IllegalStateException("Reference annotation is not supported on static methods"); |
| } |
| |
| /* |
| if (Modifier.isPrivate(method.getModifiers())) { |
| throw new IllegalStateException("Reference annotation is not supported on private methods"); |
| } |
| */ |
| |
| if (method.getParameterTypes().length == 0) { |
| throw new IllegalStateException( |
| "Reference annotation requires at least one argument: " + method); |
| } |
| |
| PropertyDescriptor pd = BeanUtils.findPropertyForMethod(method); |
| if (pd != null) { |
| String refName = annotation.name(); |
| if ("".equals(refName)) { |
| injectReference(bean, pd, pd.getName()); |
| } else { |
| injectReference(bean, pd, refName); |
| } |
| } |
| } |
| } |
| }); |
| |
| ReflectionUtils.doWithFields(clazz, new ReflectionUtils.FieldCallback() { |
| public void doWith(Field field) { |
| |
| Reference annotation = (Reference)field.getAnnotation(getReferenceAnnotationType()); |
| |
| if (annotation != null) { |
| if (Modifier.isStatic(field.getModifiers())) { |
| throw new IllegalStateException("Reference annotation is not supported on static fields"); |
| } |
| |
| /* |
| if (Modifier.isPrivate(field.getModifiers())) { |
| throw new IllegalStateException("Reference annotation is not supported on private fields"); |
| } |
| */ |
| |
| ReflectionUtils.makeAccessible(field); |
| |
| Object referenceObj = null; |
| String refName = annotation.name(); |
| if ("".equals(refName)) { |
| referenceObj = component.getService(field.getType(), field.getName()); |
| } else { |
| referenceObj = component.getService(field.getType(), refName); |
| } |
| |
| if (referenceObj != null) |
| ReflectionUtils.setField(field, bean, referenceObj); |
| } |
| } |
| }); |
| } |
| |
| /** |
| * Processes a property descriptor to inject a service. |
| */ |
| public void injectReference(Object bean, PropertyDescriptor pd, String name) { |
| |
| Object referenceObj = component.getService(pd.getPropertyType(), name); |
| |
| if (referenceObj != null) { |
| try { |
| pd.getWriteMethod().invoke(bean, new Object[] {referenceObj}); |
| } catch (Throwable e) { |
| throw new FatalBeanException("Problem injecting reference: " + e.getMessage(), e); |
| } |
| } |
| } |
| } |